No abstract

The polyol reduction of a Ag precursor in the presence of an organic stabilizer, such as poly(vinylpyrrolidone), is a widely used method for the production of Ag nanowires (NWs). However, organic capping molecules introduce insulating layers around each NW. Herein we demonstrate that Ag NWs can be produced in high yield without any organic stabilizers simply by introducing trace amounts of NaCl and Fe(NO3 )3 during low-temperature polyol synthesis. The heterogeneous nucleation and growth of Ag NWs on initially formed AgCl particles, combined with oxidative etching of unwanted Ag nanoparticles, resulted in the selective formation of long NWs with an average length of about 40 μm in the absence of a capping or stabilizing effect provided by surface-adsorbing molecules. These organic-stabilizer-free Ag NWs were directly used for the fabrication of high-performance transparent or stretchable electrodes without a complicated process for the removal of capping molecules from the NW surface.

No abstract

While the significant advancements have made in the generation of deepfakes using deep learning technologies, its misuse is a well-known issue now. Deepfakes can cause severe security and privacy issues as they can be used to impersonate a person's identity in a video by replacing his/her face with another person's face. Recently, a new problem of generating synthesized human voice of a person is emerging, where AI-based deep learning models can synthesize any person's voice requiring just a few seconds of audio. With the emerging threat of impersonation attacks using deepfake audios and videos, a new generation of deepfake detectors is needed to focus on both video and audio collectively. A large amount of good quality dataset is typically required to capture the real-world scenarios to develop a competent deepfake detector. Existing deepfake datasets either contain deepfake videos or audios, which are racially biased as well. Hence, there is a crucial need for creating a good video as well as audio deepfake dataset, which can be used to detect audio and video deepfake simultaneously. To fill this gap, we propose a novel Audio-Video Deepfake dataset (FakeAVCeleb) that contains not only deepfake videos but also respective synthesized lip-synced fake audios. We generate this dataset using the current most popular deepfake generation methods. We selected real YouTube videos of celebrities with four racial backgrounds (Caucasian, Black, East Asian, and South Asian) to develop a more realistic multimodal dataset that addresses racial bias, and further help develop multimodal deepfake detectors. We performed several experiments using state-of-the-art detection methods to evaluate our deepfake dataset and demonstrate the challenges and usefulness of our multimodal Audio-Video deepfake dataset.Preprint. Under review.

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In this study, we explored Ag-nanowire electrodes embedded on the surface of an elastic acrylic polymer-silicate nanoparticle composite resin (iGloss) for mechanically robust flexible electronic devices. Nanoindentation analysis indicated that the iGloss film was suitable for flexible electronic applications, having modulus and hardness values similar to those of a conventional poly(ethylene terephthalate) (PET) substrate. In situ resistance monitoring for up to 3000 bending cycles revealed that the Ag-nanowire-iGloss electrode was highly flexible without showing an increase in the resistance. In addition, while a PET substrate carrying Ag nanowires exhibited significantly degraded optical properties with an increase in scratch damage, the Ag-nanowire-iGloss electrode exhibited superior wear resistance, even when it was subjected to a severe mechanical scratch test. Finally, as a possible application, we demonstrated a flexible, organic, light-emitting diode with an Ag-nanowire-iGloss electrode as both the anode and the substrate.

No abstract

The polyol reduction of aA gp recursor in the presence of an organic stabilizer,s uch as poly (vinylpyrrolidone), is aw idely used method for the production of Ag nanowires (NWs). However,organic capping molecules introduce insulating layers around each NW.H erein we demonstrate that Ag NWs can be produced in high yield without any organic stabilizers simply by introducing trace amounts of NaCl and Fe(NO 3 ) 3 during low-temperature polyol synthesis. The heterogeneous nucleation and growth of Ag NWs on initially formed AgCl particles,c ombined with oxidative etching of unwanted Ag nanoparticles,resulted in the selective formation of long NWs with an average length of about 40 mm in the absence of ac apping or stabilizing effect provided by surface-adsorbing molecules.T hese organic-stabilizer-free Ag NWs were directly used for the fabrication of high-performance transparent or stretchablee lectrodes without ac omplicated process for the removal of capping molecules from the NW surface. Prof. S. M. Cho School of ChemicalE ngineering, SungkyunkwanU niversity (SKKU) Suwon 16419 (Korea) [ + + ]T hese authors contributed equally. Supportinginformation for this article can be found under: http://dx.